Lathe-chuck.



No. 725,774. PATENTED APR. 21, 1903. G. G. RICHARDSON- LATHE GHUGK.

APPLICATION FILED 00181, 1902.

N0 MODEL.

IIIIIIIIHIHI lmmmm INVENTOR ATTORNEY WITNESSES: %%m' UNITED STAT SPATENT OFFICE.

CHARLES G. RICHARDSON, OF SPRINGFIELD, VERMONT, ASSI GNOR TO DE LAVALSTEAM TURBINE COMPANY, A CORPORATIONOF 'NEW JERSEY.

LATHE-CHUCK.

SPECIFICATION forming part of Letters Patent No. 725,774, dated April21,- 1903.

Application filed October 31, 1902. Serial No. 129,543. (No mo ie To allwhom, it may concern:

Be it known that I, CHARLES G. RICHARD- SON,ofSpringfieldJVindsorcounty,Vermont, have invented a new and useful Improvement inLathe-Chucks, of which the following is a specification.

My invention relates to a lathe-chuck; and it consists in theconstruction and combination of parts, as more particularly set forth inthe claims.

In the accompanying drawings, Figure 1' is chuck-body. Fig. 8 is a sideelevation, and

Fig. 9 an end view, of the collet-jaws. Fig. 10 is a perspective view ofone of the swinging dogs which engage with the chuck-body shown in Fig.7.

Similar numbers of reference indicate like parts.

1 is the internally-tapered chuck-body,hav-

ing a threaded portion 2, whereby it is se-- cured upon thelathe-spindle. Fitting within the outer tapered portion of said body arethe tapered jaws 3. Four jaws are here shown, each havinga shoulder 18.Surrounding said body is another sleeve 4, which is internally threadedto receive the ring 5, which when in place, as shown in Fig. 2, forms aflange.

The inner periphery of said ring surrounds the projecting outer portion6 of the body 1- and has a flange'which bears upon the shoulder 18 onthe jaws 3. Around the rear end of the sleeve 4 are a number of T-shapedslots 7, each of which receives a dog 8. Each dog has a pivot-shaft 9,which lies in the transverse portion of the slot 7, and anupwardlycurved orrounded back 10. The downwardlyprojecting hook 11 ofeach dog lies in a groove 12,formed aroundthechuck-bodyl. Finallysurrounding the sleeve 4 and fitting upon the rounded backs of all thedogs 8 and movable,

longitudinally thereon is an operating-collar 13, provided with theusual external groove 14 for the reception of any suitable device forimparting to it longitudinal movement. Said collar internally has aflared portion 15 and a portion of greater diameter 16. 5

ferring to Fig. 2, it will be observed that the hook 11 of each .dog isdownwardly tapered and that the sides of said hook do not-both bear uponthe internal tapered surfaces of the groove. Thus in Fig. 2 it will beseen that there is a space or interval represented at 17 between theouter side of the hook and the internal surface of the groove 12, Whilethe opposite side of the hook bears directly against the groove-surface,a slight space being left,

however, in Fig. 2 for the sake of clearness.

Assuming the parts to be in the condition of engagement-thatis,when thejaws are closed tightly upon the work, which is introduced, as usual,inthe substantially cylindrical space between themin order to release thework the operating-collar 13 is moved to the right in Fig. 2. Thisbrings the flared inner portion 15 of said collar over theupwardlyrounded backs of all the dogs 8, so that said dogs are thenpermitted to rise into said flared 8o portion. The state of tensionwhich exists between the pivot-shafts of the dogs 9 on one side and thebearing of the right-hand faces of the hooks of the dogs against theopposing surface of the groove 12 on; the other side is 8 5 relieved,and as a consequence the sleeve 4 rmovesover slightly to the'right ofFig. 2. The

taper'ofthe jaws 3 andof their seat in the body 1 is such that when inthe manner described the pressure of the flange of the seicuring-ring 5upon the shoulders 18 of the jaws is relieved said jaws thenautomatically and collectively move longitudinally outward from thechuck, while the individual. jawsseparate radially,thus'releasing thework con- 5 tained between them. "The reverse operation closes the jawsupon the work and brings the parts back to the positions shown in Fig.2.

I claim- 1. The combination with the annularly- I00 grooved ohuckbodyand its inwardly-movable jaws,of a jaw-operating sleeve surrounding saidchuck-body,a series of movable hooks pivoted at their forward ends tothe rear end of said sleeve with their inwardly-hooked rear endsentering said annular groove and by engagement with one wall thereofactuating the said jaw-operating sleeve, and a longitudinally-movablehook-operatin g ring surrounding the said jaw-operating sleeve andengaging its hooks, substantially as set forth.

2. The combination in a lathe-chuck of the body 1, having a taperingjaw-seat and external groove 12, taper jaws adapted to enter said seatand provided with shoulder 18, sleeve 4 having slots 7 and surroundingsaid body 1, ring 5 received in said sleeve 4: and bearing upon saidchuck-body and said j aw-shoulder, dogs 8 pivoted in said slots 7 andengaging with said groove 12 and operating-ring 13 having internalflared portion 15, and surround- In testimony whereof I have signed my Jname to this specification in the presence of two subscribing witnesses.

CHARLES G. RICHARDSON. Witnesses:

WM. H. SIEGMAN, I. A. VAN WART.

